The SGM3140 is a current-regulated buck/boost charge pump LED driver capable of driving 500mA output current. It is ideal for powering high brightness LEDs for camera flash applications.

The SGM3140 has 1×/2× operation mode to control the output current for flash and torch modes. The supply voltage operates from 2.7V to 5.5V and is well suited for various applications powered by a 1-cell Li-Ion battery, as well as 3-cell or 4-cell NiCd, NiMH or Alkaline batteries.

The SGM3140 automatically converts between boost and buck modes. Therefore, it ensures that LED current cannot be restricted by the forward voltage. High switching frequency makes it easy to use tiny components. Small 0603 current sense resistors can be used due to the low FB reference voltage.

The SGM3140 provides very low shutdown current and soft-start function. Built-in soft-start circuitry avoids excessive inrush current during startup.

The SGM3140 also includes a comprehensive set of protection features such as over-voltage protection, over-current protection and thermal shutdown. The SGM3140 is available in a Green TDFN-3×3-10L package and is specified over an ambient temperature range of -40℃ to +85℃.

FEATURES

● Input Voltage Range: 2.7V to 5.5V

● Up to 500mA Output Current

● Up to 90% Efficiency in Torch Mode

● Programmable Flash Current

● Automatic Buck/Boost Mode Conversion

● No External Inductors

● High Switching Frequency: 2.2MHz

● Low Reference for Low Loss Sensing: 47mV

● Less than 1μA Shutdown Current

● Automatic Soft-Start for Reducing Inrush Current

● Low Input and Output Ripple and Low EMI

● Protection Features

 Output Over-Voltage Protection

 Over-Current Protection

 Thermal Shutdown

● Available in a Green TDFN-3×3-10L Package

APPLICATIONS

White LED Torch or Flash for Cell Phones,

Camcorders and DSCs Generic Lighting,

Strobe and Flash Applications White LED Backlighting

General Purpose High Current Boost